package thread;

public class ThreadDemo {
    public static void main(String[] args) {
        Thread t1 = new MyThread1();
        Thread t2 = new MyThread2();
        t1.start();
        t2.start();
    }
}
class MyThread1 extends Thread{
    public void run(){
        for (int i = 0; i < 2000; i++) {
            System.out.println("开门，查水表！");
        }
    }
}
class MyThread2 extends Thread{
    public void run(){
        for (int i = 0; i < 2000; i++) {
            System.out.println("没人在家！");
        }
    }
}